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arXiv 2501.01337cond-mat.mes-hall
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拓扑绝缘体表面的拓扑绝缘体表面Skyrmion晶格中的手性电子网络

Chiral electronic network within skyrmionic lattice on topological insulator surfaces

Matteo Wilczak, Dmitry K. Efimkin, Victor Gurarie

AI总结:

研究拓扑绝缘体表面Skyrmion晶格中手性电子网络的形成与低能带特性,通过带重构方法揭示其电子行为。

摘要:

我们考虑了拓扑绝缘体的Dirac表面态与绝缘磁体的Skyrmion相之间的近邻效应。单个Skyrmion导致表面态具有被限制在Skyrmion周界的手性无质量模式。对于Skyrmion晶格,受限态之间的隧道耦合导致形成延展至整个系统的低能带。我们展示了通过现象学手性网络模型结合kagome晶格几何结构可以研究这些带的结构。虽然网络模型本身可以处于无法通过外部周期驱动获得的chiral Floquet相,我们展示了如何通过一种称为带重构的程序来获得无外部驱动情况下拓扑绝缘体表面电子的低能带。我们得出结论,带重构对于最近引入以描述不同纳米结构电子性质的网络模型的广泛类别至关重要。

英文摘要:

We consider a proximity effect between Dirac surface states of a topological insulator and the skyrmion phase of an insulating magnet. A single skyrmion results in the surface states having a chiral gapless mode confined to the perimeter of the skyrmion. For the lattice of skyrmions, the tunneling coupling between confined states leads to the formation of low energy bands delocalized across the whole system. We show that the structure of these bands can be investigated with the help of the phenomenological chiral network model with a kagome lattice geometry. While the network model by itself can be in a chiral Floquet phase unattainable without external periodic driving, we show how to use a procedure known as band reconstruction to obtain the low energy bands of the electrons on the surface of the topological insulator for which there is no external driving. We conclude that band reconstruction is essential for the broad class of network models recently introduced to describe the electronic properties of different nanostructures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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